I'm not sure which pokemon are useless in-game tbh. Care to elaborate? Unless you want to finish the game with just a magikarp holding an everstone I don't really see how that's true. Also 'years of egg farming' is such a ridiculous statement. As soon as you have a bunch of 5-6 IV parents it takes absolutely no time to get good offsprings. And in case you haven't kept up, they will apparently be changing that in gen 7 so that you can boost to 6 perfect IV's at lvl 100. Also in case you're forgetting, EV's are very much custimization you have total control over (which I think is phrased absolutely weirdly because IV's,nature and moves are also totally controlable).